Lamp support arm



FIG. 1 is a perspective view of a lamp support arm showing my newdesign;

FIG. 2 is a front view thereof;

FIG. 3 is aback view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is an exploded view of the lamp support arm thereof;

FIG. 9 is an enlarged view of the selected portion 9 in. FIG. 1.

The broken lines shown in the drawings depict portions of the lampsupport arm that form no part of the claimed design.

CLAIM The ornamental design for a lamp support arm, as shown anddescribed.